Epithelial Tissues

Question 1

Composition of ET

Answer 1

99% cell and very little matrix

Question 2

tissue math equation

Answer 2

(collection of cells) + matrix they produce= Tissue

Question 3

Epi

Answer 3

on top

Question 4

Epithelium

Answer 4

one

Question 5

Epithelia

Answer 5

many

Question 6

Features/Locations of ET

Answer 6

outerskin, lines body cavities, tubes, ducts, covers organs

• can be one cell layer or many cell layers
• Avascular
• tightly packed cells little matrix

Question 7

Functions of ET

Answer 7

protection, absorption, filtration, diffusion, regenerative, secretive, and sensation.

Question 8

Simple

Answer 8

one cell layer

Question 9

Shapes

Answer 9

squamous, cuboidal, and columnar

Question 10

basement membrane

Answer 10

sheet-like barrier of extracellular material between epithelial cells and underlying CT; attaches 2 layers produced by both
“Glue like”

Question 11

Intercellular Junctions

Answer 11

tight junctions, desmosome, and Gap Junctions

Question 12

tight junction

Answer 12

complete attachment between cells; Fused band “glue tube”

Question 13

Demosome

Answer 13

spot attachment “dot of glue”

Question 14

Gap Junction

Answer 14

disc with holes, passageway for small molecules

Question 15

Simple Squamous ET

Answer 15

single layer, flattened, irregularly shaped, and fragile

fx: diffusion —resp gases

Question 16

Endothelium (simple squamous ET)

Answer 16

line blood vessels and heart chambers

Question 17

mesothelium

Answer 17

lines body cavities, covers organs

Question 18

Simple Cuboidal epithelium

Answer 18

lines small ducts/tubes that have a secretory fxn

fxn: excretory, secretory, and absorptive (ex. thyroid cells)

Question 19

follicle

Answer 19

chamber

Question 20

lumen

Answer 20

space inside structure

Question 21

epithelium

Answer 21

one

Question 22

epithelia

Answer 22

many

Question 23

Simple columnar epithelium

Answer 23

fxn: secretion or absorption

in- digestive and respiratory tracts associated with goblet cell
- can have projections (cilia and microvilli)

Question 24

Goblet cell

Answer 24

1 cell gland that secrete mucus

Question 25

Cilla (projection)

Answer 25

naming ex. simple cillated columnar epithelium -they beat like windshield wipers, move materials

Question 26

Microvilli

Answer 26

form a brush boarder | this increases surface area and thus absorption

Question 27

Stratified epithelium

Answer 27

layers worn away and replaced via mitosis in the deepest cell layer Classified by surface cell shape

Question 28

Stratified squamous epithelium

Answer 28

variable number of layers 2 types: Keratinized and Non-keratinized

Question 29

Keratin

Answer 29

protein- provides strength and water proofing

Question 30

Keratinized cell

Answer 30

- strong, waterproof - cells undergo death when being keratinized - outer skin

Question 31

Non-keratinized cell

Answer 31

remain alive - lining of tubes of oral cavity, vagina, esophagus, anal canal - Characteristics: moist,layered, and alive.

Question 32

Transitional Epithelium

Answer 32

- Similar to SSE but surface cells are rounded | - capable of changing shape- allow for distention; urinary system

Question 33

Pseudostratified columnar epithelium

Answer 33

appears stratified but each cell has contact with the basement membrane

Question 34

Sensory Epithelia

Answer 34

associated with the nervous system

Question 35

Glandular Epithelia

Answer 35

Cells doing the secreting | 2 types - endocrine and exocrine glands

Question 36

gland

Answer 36

cell, tissue, or organ that produces and secretes a substance for use in or elimination from the body

Question 37

Exocrine Glands

Answer 37

exo= outside crine= to sieve or separate products go into ducts or lumen of an organ going to the outside of the body. Ex. salivary glands, sebaceous glands , pancreas (digestive enzymes)

Question 38

Endocrine Glands

Answer 38

endo= inside products = hormones that hit the blood ex. thyroid gland, adrenal gland, pancreas (insulin)

Question 39

Formation of Glands

Answer 39

look at the handout in a nutshell... -epithelial cell can be pushed down into connective tissue -cells pushed down can hollow out

Question 40

8 Types of ET

Answer 40

1. Glandular Epithelia 2. Sensory Epithelia 3. Pseudostratified columnar epithelium 4. Transitional Epithelium 5. Stratified Epithelium 6. Simple Columnar Epithelium 7. Simple Cuboidal Epithelium 8. Simple Squamous Epithelium